Harrow.



PATENTED OUT. 31, 1905 J. SONBRHOLM.

HARROW.

APPLICATION FILED APR. 4, 1905.

[/VVEN TOR UNrT D STATES PATENT orrron HARROW.

Specification of Letters Patent.

Patented Oct. 31, 1905,

Application filed April 4:, 1905. Serial No. 253,738.

To all whmn it may concern.-

Be it known that I, JOHN SONERHOLM, a citizen of the United States,residing at Webster City, in the county of Hamilton and State of Iowa,have invented a new and useful Harrow, of which the following is aspecification.

This invention relates to that class of harrows in which the teeth arefitted in revolving beams or cross-bars; and it has for its object toconstruct a harrow of this class which shall possess superior advantagesin point of simplicity, durability, and general efficiency.

With these ends in view the invention consists in the improvedconstruction, arrangement, and combination of parts, which will behereinafter more fully described, and particularly pointed out in theclaims.

In the drawings hereto annexed, Figure 1 is a bottom plan view of aharrow embodying my improvements. Fig. 2 is an end view of the revolvingbeams or cross-bars. Fig. 3 is a sectional end view showing the skids orrunners. Fig. 4 is a detail perspective view of one of the revolvingcross-bars, showing the arrangement of the harrow-teeth. Fig. 5 is adiagram showing the construction of my improved brake.

Like numerals of reference indicate like parts in all the figures.

My improved harrow is composed of a series of parallel transverse barsor rollers, which may be round or polygonal in crosssection, which maybe constructed of wood or metal or Wood with metallic cores or gudgeons.When constructed of wood, the said rollers are bound at the ends withmetallic ferrules. The bars or rollers, which are designated by A, areeach provided with series of radially-extending teeth or spikes B,whichare provided with chisel-pointed ends C so arranged that the flattenedside of each tooth is toward the rear of the harrow at the time thetooth comes in contact with the soil in the course of the revolution ofthe toothed bar or roller. The ends of the rollers are provided withgudgeons D, which are journaled into the frame at the points E. Theteeth are arranged spirally on each roller, and the teeth on each rollerintermesh with the teeth of the roller or rollers adjacent to it.v

For convenience of adjustment of my harrow to the varying degrees ofhardness of different soils on which it may be used it is furtherprovided with a chain-brake F, which chain is securely attached to a barat the rear of the harrow-frame and winds about each roller once in thedirection of the rollers rotation and by means of which the revolutionof the toothed bars may be retarded or wholly checked by the applicationof slight pressure from the foot-lever G. When the bars are thus broughtto a standstill, the machine acts as an ordinary harrow, and in therange between its free revolution and the locked state of its rollersand teeth it becomes perfectly adaptable to every variety 0f 'soil.

The whole harrow and harrow-frame is inclosed by a box-shaped cover H,on the top of which are two skids or runners K, and the object of theskids is to provide ready means for the transportation of said harrowwhen not in use. For transportation in this manner the harrow isinverted, bringing the skids to the ground, upon which they run orslide.

A portable seat L with curved support M is inserted in the slot N,placed beneath the cover 0. The seat is detachable, and when the harrowis inverted the seat-support is reinserted in the slot 0, thus affordinga seat for the driver whether the harrow is in an up right or invertedposition.

Each of the transverse bars or rollers is provided with two circularmetallic shields P at one end, forming a guide for the chainbrake andpreventing said chain-brake from becoming entangled with the teeth. Thechain is stoutly secured to a transverse bar R at the rear of therollers, passes once around each roller in the direction of said rollersrotation, and passes about the successive rollers in turn. chain isattached to a foot-lever G at the front of the harrow, which is fastenedto and The front end of the 5 supported by a transverse bar S in theharbarrow-frame, and means for operating the pedal attachment.

4. In a revolving harrow, the combination of a series of revolvingtoothed bars, with a chain-brake encircling the bars, and means foroperating the same.

In testimony that I claim the foregoing as my own I have hereto afi ixedmy signature in the presence of two witnesses.

JOHN SON ERHOLM.

Witnesses:

FRANK J. LUND, E. E. RoREM.

